import java.util.*;
public class example3_9 {
  public static void main(String args[]) {
    Scanner reader = new Scanner (System.in);
    double sum =0;
    int m=0;
    while(reader.hasNextDouble()) {
       double x = reader.nextDouble();
       m=m+1;
       sum=sum+x;
    }
    System.out.printf("%d个数的和为%f\n",m,sum);
    System.out.printf("%d个数的平均值是%f\n",sum/m);
  }
}
